Ladder Climb Air Force Staff Sgt. Wilson Brantley takes part in the obstacle course portion of the Air Education and Training Command Defender Challenge team tryout at Joint Base San Antonio-Medina Annex, Texas, Jan. 29, 2020. SHARE IMAGE: Download Image: Full Size (7.69 MB) Tags: Air Force Photo By: Sarayuth Pinthong, Air Force VIRIN: 200129-F-GY993-050.JPG Photo Gallery